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- Add uint8ArrayToMultiString and bufferedUint8ArrayToMultiString TypeConversionFunctions to facilitate transfer of Strings containing null values. - Add HKDF to CryptoInterface. - Add ChaCha20 + Poly1305 AEAD to CryptoInterface. - Add customizable nonce generator to CryptoInterface. - Add ability to automatically encrypt/decrypt ESP-NOW messages via AEAD (ChaCha20 + Poly1305), independent from encrypted ESP-NOW connections. - Greatly improve performance of incrementSessionKey, espnowGetMessageID, espnowSetMessageID and all non-template TypeConversionFunctions. The average performance increase is roughly a factor 5. Fun fact: Printing a MAC to a HEX String is now over twice as fast when using TypeConversionFunctions compared to using standard functionality like sprintf. - Add uint64ToUint8Array and uint8ArrayToUint64 TypeConversionFunctions. - Make it possible to use String values as ESP-NOW and FloodingMesh key seeds, instead of just requiring plain key arrays. - Add customizable responseTransmittedHook to sendEspnowResponses. - Add _responsesToSendMutex to make the new responseTransmittedHook safe to use. - Remove verboseModePrinting from sendPeerRequestConfirmations method to reduce performance variations. - Fix faulty messageID generation in FloodingMesh. - Make assert checks more complete and easier to understand in the setMetadataDelimiter method of FloodingMesh. - Rename EspnowEncryptionKey to EspnowEncryptedConnectionKey since there are now multiple encryption keys. - Rename acceptsUnencryptedRequests to acceptsUnverifiedRequests, unencryptedMessageID to unsynchronizedMessageID, receivedEncryptedMessage to receivedEncryptedTransmission, since there are now multiple modes of encryption. - Rename resultArrayLength to outputLength in CryptoInterface and remove its value restrictions in order to match the BearSSL functionality. - Improve performance of FloodingMesh::encryptedBroadcast. - Rename FloodingMesh methods maxUnencryptedMessageSize/maxEncryptedMessageSize to maxUnencryptedMessageLength/maxEncryptedMessageLength, so that String length naming is consistent within the library. - Update examples to illustrate the new features. - Improve comments.